Make documentation of all those incidents that you wrote in your post, including the ones leading up to the sick day harrassment. Proving a pattern of behaviour is key to proving harrassment, so you need as much detail as possible. He will either smarten up or get worse and really hang himself.
Is this workplace harassment?
Yes it is harassment,
And I would encourage you to compile your phone records, get a sworn statement from your BF, and collect all evidence from when he messed with your pay, and benefits. If you are able to provide that allong with your testamony they/he will see you mean business. Always cover your own bottom, no matter how trivial it may seem at the time.
babygirl, he obviously does not deserve you as part of his team and his actions seem to based on an insecurity of the fact that without you he will be exposed for his weaknesses...... Hang in there and stand up for your rights. Cheers, Mattieu